The Buy American Act is a federal law enacted in 1933 that aims to encourage the purchase of American-made goods by the U.S. government. It requires that federal agencies prioritize domestic products when spending taxpayer dollars on public projects, ensuring that a significant portion of materials and supplies used are sourced from within the United States. This act applies to various government contracts, particularly in construction and manufacturing. Exceptions exist for certain circumstances, such as when domestic products are not available or are excessively priced. Overall, the Buy American Act supports local industries and promotes job creation in the U.S. economy.